Upgrade rust/crates/regex to 1.5.4

Test: make
Change-Id: I0eab39246dc2aea41a62c15661e350b490f06c1d
diff --git a/test b/test
index 3d1351c..b10564f 100755
--- a/test
+++ b/test
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+set -e
+
 # This is a convenience script for running a broad swath of tests across
 # features. We don't test the complete space, since the complete space is quite
 # large. Hopefully once we migrate the test suite to better infrastructure